import type { Feed } from './types.js';

export function parseCountString(raw: string | number | null | undefined): number {
  if (typeof raw === 'number') {
    return Number.isFinite(raw) ? raw : 0;
  }

  const text = (raw ?? '').toString().trim().replace(/,/g, '');
  if (!text) return 0;

  if (text.endsWith('万')) {
    const num = Number.parseFloat(text.slice(0, -1));
    if (Number.isNaN(num)) return 0;
    return Math.round(num * 10_000);
  }

  const intNum = Number.parseInt(text, 10);
  return Number.isNaN(intNum) ? 0 : intNum;
}

export function detectCaptchaText(text: string): boolean {
  const haystack = text.toLowerCase();
  return (
    haystack.includes('captcha') ||
    haystack.includes('show_captcha') ||
    haystack.includes('验证码') ||
    haystack.includes('tencentcaptcha')
  );
}

export function extractLinkIdFromUrl(rawUrl: string): string | undefined {
  const trimmed = rawUrl.trim();
  if (!trimmed) return undefined;

  try {
    const url = /^https?:\/\//i.test(trimmed)
      ? new URL(trimmed)
      : trimmed.startsWith('/')
        ? new URL(`https://www.xiaoheihe.cn${trimmed}`)
        : new URL(`https://${trimmed}`);

    const pathMatch = url.pathname.match(/\/app\/bbs\/link\/(\d+)/);
    if (pathMatch?.[1]) return pathMatch[1];

    const queryLinkId = url.searchParams.get('link_id') ?? url.searchParams.get('linkid');
    return queryLinkId || undefined;
  } catch {
    return undefined;
  }
}

export function extractUserIdFromUrl(rawUrl: string): string | undefined {
  const trimmed = rawUrl.trim();
  if (!trimmed) return undefined;

  try {
    const url = /^https?:\/\//i.test(trimmed)
      ? new URL(trimmed)
      : trimmed.startsWith('/')
        ? new URL(`https://www.xiaoheihe.cn${trimmed}`)
        : new URL(`https://${trimmed}`);

    const pathMatch = url.pathname.match(/\/app\/user\/profile\/(\d+)/);
    if (pathMatch?.[1]) return pathMatch[1];

    const queryUserId = url.searchParams.get('userid') ?? url.searchParams.get('user_id');
    return queryUserId || undefined;
  } catch {
    return undefined;
  }
}

export function parseFeedsFromHtmlSnapshot(html: string): Feed[] {
  const matches = [...html.matchAll(/href="(\/app\/bbs\/link\/\d+)"/g)];
  const seen = new Set<string>();
  const feeds: Feed[] = [];

  for (const m of matches) {
    const href = m[1];
    if (!href) continue;
    const id = extractLinkIdFromUrl(href);
    if (!id || seen.has(id)) continue;
    seen.add(id);

    feeds.push({
      id,
      title: '',
      description: '',
      coverUrl: '',
      likeCount: 0,
      commentCount: 0,
      user: {
        id: '',
        nickname: '',
        avatar: '',
      },
      linkUrl: `https://www.xiaoheihe.cn${href}`,
    });
  }

  return feeds;
}

export function firstNonEmpty(...values: Array<string | null | undefined>): string {
  for (const value of values) {
    const trimmed = value?.trim();
    if (trimmed) return trimmed;
  }
  return '';
}